# Copyright (c) 2011 Bryce Lelbach
# Copyright (c) 2012-2013 Hartmut Kaiser
#
# SPDX-License-Identifier: BSL-1.0
# Distributed under the Boost Software License, Version 1.0. (See accompanying
# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

# find required packages
if(HPX_WITH_DOCUMENTATION)
  find_package(Doxygen)
  find_package(Sphinx)
  find_package(Breathe)

  if(NOT Sphinx_FOUND)
    hpx_error(
      "Sphinx is unavailable, sphinx documentation generation disabled. Set Sphinx_ROOT to your sphinx-build installation directory."
    )
    set(HPX_WITH_DOCUMENTATION OFF)
  elseif(NOT Breathe_FOUND)
    hpx_error(
      "Breathe is unavailable, sphinx documentation generation disabled. Set Breathe_APIDOC_ROOT to your breathe-apidoc installation directory."
    )
    set(HPX_WITH_DOCUMENTATION OFF)
  elseif(NOT DOXYGEN_FOUND)
    hpx_error(
      "Doxygen tool is unavailable, sphinx documentation generation disabled. Add the doxygen executable to your path or set the DOXYGEN_EXECUTABLE variable manually."
    )
    set(HPX_WITH_DOCUMENTATION OFF)
  endif()
endif()